Grinding machine



Patented Oct. 27, 1953 GRINDING MACHINE Harold E. Drake, Fostoria, Ohio Original application May 19, 1947, Serial No. 748,866. Divided and this application November 15, 1951, Serial No. 256,474

3 Claims.

vide improved means for supporting grinding plates from vertically reciprocable arms.

A still further object of the invention is to provide novel grinding plates.

Other objects and advantages of the invention will become apparent in the course of the following detailed description, taken in connection with the accompanying drawing, wherein:

Figure 1 is a fragmental side elevational view of a grinding machine and disclosing the novel features of the present invention.

Fig. 2 is a side elevational view of a grinding machine, on substantially reduced scale, and showing the novel features of the present invention in operative association with a suitable mechanism for effecting vertical reciprocation of the rocker arms.

Fig. 3 is a top plan view of the grinding machine shown in Fig. 2 and to the same scale as Fig. 1.

Fig. 4 is a rear elevational view of one of the grinding plate-supporting channel members.

Fig. 5 is a front elevational view of one of the grinding plates.

Before proceeding with the detailed description, it is here pointed out that the novel features of the present invention are designated on the drawing by reference numerals, while the rocker arm reciprocating mechanism, which forms no part of the present invention, is desig nated by alphabetical letters, the said mechanism being shown solely for clarification of the operation of the rocker arms.

Referring now to the drawing, the present invention comprises two pairs of generally vertically disposed rocker arms In and I l Whose upper ends are pivotally connected to a pair of rocker bars I2, as is indicated at 13.

Disposed between the lower ends of each pair of rocker arms I0, II is a vertically elongated channel member. The opposite side flanges of the channel members rest against the inner faces of the respective pairs of rocker arms H], II and are secured thereto as by bolts 15.

The bases of the channel members oppose each other, and from Fig. 1 it will be seen that the rocker arms Hi, ll slightly converge downwardly from their pivotal connections 13, the upper portions of the bases of the channel members converge downwardly at a greater angle than the arms, and the lower portions of the bases converge downwardly at substantially the same angle as the rocker arms.

A grinding plate [6 is disposed on the front wall of the base of each channel member and adjacent the lower ends of the channel members.

Each grinding plate has a serrated face 47 and an upper angular face ll which, with the aforementioned convergencies of the rocker arms and channel members, facilitate the feeding of materials to be ground between the serrated faces of the grinding plates.

Each grinding plate [6 is removably secured to a corresponding channel member by means of a pair of screw bolts l8 which extend through apertures la in brackets 2|] at the rear of the channel member base, as well as the base, and which thread into tapped apertures 2i in the grinding plates.

The brackets are provided with spaced apertured ears 22. Pivotally secured at one end thereof to ears 22 of one channel member, as by means of bolt 23, is a radius bar 24 whose opposite end is pivotally secured on a bolt 25 extending through ears 25 of brackets 21 which are secured as by bolts 28 to a suitable support 29.

Pivotally secured to the ears 22 of the opposed channel member as by means of a bolt 3| is one end of a radius rod 30 which is horizontally alined with the radius bar 26. The rod adjacent its opposite end extends loosely through a block 32 pivotally secured to ears 33 of brackets 34 by means of studs 35. The brackets 34 are secured by bolts 36 to a suitable support 31.

The radius rod 39 is threaded at each side of the block 32, and an adjusting hand wheel 38 threadedly engages the rod beyond the block and is provided with a hub 39 engageable with the adjacent end of the block.

A nut 40 is threadedly engaged with the rod on the opposite side of the block, and a coil spring 4| is disposed between the nut and the adjacent end of the block in encircling relation to the rod.

The rocker arms III, Il may be vertically re- 3 ciprocated by various means, but a satisfactory mechanism for effecting such reciprocation may embody a rock shaft A rotatably supported adjacent its opposite ends in suitable fixed bearings B (only one of which is shown).

The pair of rocker bars l2 receive the shaft A and are secured thereto as by means of set screws C whereby the rocker bars are rockably movable with the shaft.

Interposed between the rocker bars and freely rotatable on the shaft A is a combined pulley and drive sprocket comprising a pulley D and a sprocket E. A shaft F extends through the rocker bars 12 adjacent each end thereof, and

such shafts are secured tothe bars by studs G.

A relatively large sprocket, wheelfH-is rotatably supported on each shaft F in alinement with the smaller driving sprocket E and a sprocket chain I engages the sprockets E and H in the manner indicated in Fig. 2, whereby clockwise rotation of sprocket E imparts counterclockwise rotation to sprocket wheels H, as indicated by the arrows.

The small sprocket E is driven by a belt J from a suitable motor disposed above the machine.

Counterweights K are suitably attached to the sprocket wheels H, and the counterweight on one wheel is displaced 180 from that on the other wheel.

The momentum of the weights K is counterbalanced when disposed on opposite sides of the rock shaft A, but as the weights pass this position to that indicated in Fig. 2, wherein the left-hand weights are moving downwardly and the right-hand weights are moving upwardly, the rocker bars [4 and shaft A therewith will be rocked to the position indicated.

In this position, the left-hand grinding plate l6 has moved downwardly and the right-hand one upwardly. Upon further rotation of the sprocket wheels H and the weights K, those on the left will move upwardly, while those on the right will move downwardly, which will result in the rocker bars being rocked in an opposite direction.

The radius bar 24 and the radius rod 30 maintain the grinding plates H in proper operative relation, and one plate may be adjusted toward or from the other through operation of the hand wheel 88 to suit any. particular grinding requirements.

Should metal or other hard objects enter between the grinding plates, the spring 4] will permit relative separation of the plates and thereby avoid damage thereto.

While I have disclosed my invention in accordance with a single specific embodiment thereof, such is to be considered as illustrative only, and not restrictive, the scope of the invention being defined in the following claims.

What I claim anddesire to secure by U. S. Let ters Patent is:

1. In a grinding machine, a pair of generally horizontal laterally spaced rocker bars supported substantially centrally of their ends on a shaft for rocking movement about the axis thereof, two opposed pairs of vertically reciprocable arms having their upper ends pivotally connected to said rocker bars in equally spaced relation to the said axis of the shaft, a channel member disposed between the arms of each pair thereof adjacent their lower ends and having its side flanges secured thereto, the bases of the channel members opposing each other in slightly spaced relation, and a grinding'plate secured to the base of each channel member in facing relation to each other.

2. The structure according to claim 1, to-

v gether with a radius-bar having one end thereof one end thereof pivotally connected to the other channel member and having an axially adjustable and pivotal connection with a fixed support.

3. The structure according to claim 1, together with a radius rod having one end thereof pivotally connected to one of said channel members, said rod slidably extending through a block pivotally connected to a fixed support, a spring adjustably supported on said rod at the side of said block adjacent said channel member, said rod being threaded at its opposite end and an adjusting hand wheel threadedon. said opposite end at the side of'said block distant from said channel member and normally engaging the adjacent side of said block, and means horizontally positioning the other channel member.

- HAROLD E. DRAKE.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 51,537 Austin Dec. 19, 1865 54,884 Fowler May 22, 1866 69,659 Goodwin et al. Oct. 8, .1867 137,939 Marsden Apr. 15, 1873 187,414 Marsden Feb. 13, 1877 233,192 Bean Oct. 12, 1880 286,723 McDowell Oct. 16, 1883 376,975 Adie Jan. 24, 1888 409,084 Weller Aug. 13, 1889 472,367 Knapp Apr. 5, 1892 650,458 Faries May 29, 1900 678,812 Patrick July 16, 1901 864,444 Boileau Aug. 27, 1907 867,711 Eitte Oct. 8, .1967 1,268,479 Liggett .June 4,1918 1,286,617 Hibbard Dec. 3, 1918 1,491,430 Stebbins Apr. 22, 1924 1,664,877 First Apr. 3, 1928 1,676,285 Prell July 10, 1928 2,021,377 Poland Nov. 19, 1935 2,212,872 Barker Aug. 27, 1940 2,293,962 Baily Aug. 25,1942

FOREIGN PATENTS Number Country Date 42,337 France Apr. 10, 1933 ,,(Addition to No. 745,586)

84,441 Switzerland July 16, 1920 253,825 Great Britain June 24, 1926 448,658 Germany "Aug. 22, 1927 535,851 Great Britain Apr. 24, 1941 607,040 France Mar. 22, 1926 

